Table 4 Regression coefficients for association between selected lung function variables and cannabis and tobacco use
Lung function variableCannabis association per joint-year OR (95% CI)Tobacco association per pack-year OR (95% CI)
FEV1/FVC ratio–0.019 (–0.033 to –0.0048)–0.15 (–0.20 to –0.096)
sGaw (/s.kPa)–0.0017 (–0.0026 to –0.0009)–0.007 (–0.01 to –0.004)
FRC (l)0.0013 (–0.00013 to 0.0027)0.0057 (0.0005 to 0.0109)
TLC (l)0.002 (0.0004 to 0.004)–0.0006 (–0.006 to 0.005)

  • FEV1, forced expiratory volume in 1 s; FRC, functional residual capacity; FVC, forced vital capacity; sGaw, specific airways conductance; TLC, total lung capacity.